From: Alan Bucknam (alan@notchcode.com)
Date: 02/09/03-11:24:44 PM Z
I learned this way back in the era of photoshop 3....haven't tried the
grayscale conversion Action mentioned in another post....but sounds
nice.
The green channel technique comes in when scanning a color image and
wanting to convert it to grayscale...the old-school scanner operator I
was working for (a former pressman/stripper) showed me the technique,
and said it was better than simply scanning something in grayscale
because (at the time) you got more information to start with in color.
Now, this was before the era of anything above 16-bit single-channel
scanning, so perhaps this technique is moot today :)
-Alan
On Sunday, February 9, 2003, at 08:04 PM, FDanB@aol.com wrote:
>
>
> You said in your message...
>
>> I have heard from a few sources that using the green channel in an RGB
>> scan will result in the most accurate conversion of tonal values.
>
> Are you talking about an RGB scan of a B/W original or a color
> original?
> For the former, it varies from scanner to scanner. Best thing is to
> look
> at the individual channels one at a time (making sure you have
> Photoshop's prefs set to NOT "show channels in color") to see which is
> best both tonally and for noise. If your original were a color image,
> then using Channel Mixer is the way to go. That way YOU get to call the
> shots (as opposed to leaving it up to an Adobe programmer) as to how
> much
> red, green and blue are used for your grayscale rendition.
>
> Hope this helps!
>
> Now it's back to the darkroom where I've been printing
> pigment-over-platinum all day. The Bergger Cotton 320 paper works
> soooooo
> well!
>
> Dan
>
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